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基于改进的Jackson-Hunt模型,在考虑了偏晶反应中三相之间存在密度差会引起流动的情况下,对偏晶合金定向凝固耦合共生行为进行理论分析,推导出偏晶合金定向凝固界面前沿的溶质分布方程,进而求得凝固界面前沿的过冷度;并综合考虑界面能、第二相体积分数以及液相线斜率的因素,对偏晶合金定向凝固过程中规则与非规则纤维转变提出一个新的判据。结果表明,理论预测与实验观察的第二相纤维规则情况吻合较好。
Based on the improved Jackson-Hunt model, the theoretical analysis of the directional solidification coupling behavior of the uniaxed alloy was carried out considering the density difference between the three phases caused by the flow in the non-crystallographic reaction. The orientation solidification interface And then calculate the subcooling of the front of the solidification interface. Considering the interfacial energy, volume fraction of the second phase and the slope of the liquidus, the regular and irregular fiber transformation Propose a new criterion. The results show that the theoretical predictions agree well with the observed second-phase fiber rules.